The effect that measurement error of predictor variables has on regression inference is well known in the statistical literature. However, the influence of measurement error on the ability to quantify relationships between chemical stressors and biological responses has received little attention in ecotoxicology. We present a common data-collection scenario and demonstrate that the relationship...

This paper presents a saturated proportional controller that achieves depollution of wastewater in a continuous anaerobic digester. This goal is reached by defining a region of the state-space where the depollution is achieved and forcing attractivity and invariance of this region. The control variable is the dilution rate and the controlled variable is a linear combination (S(lambda)) of the s...

In chemical analysis made by laboratories one has the problem of determining the concentration of a chemical element in a sample. In order to tackle this problem the guide EURACHEM/CITAC recommends the application of the linear calibration model, so implicitly assume that there is no measurement error in the independent variable X. In this work, it is proposed a new calibration model assuming t...

In certain physical systems measuring one variable of the system modi es the values of any number of other variables unpredictably. We show in this paper that under these conditions a parallel approach succeeds in carrying out the required measurement while a sequential approach fails. Speci cally, we show that for a nonlinear dynamical system, namely, the Belousov-Zhabotinskii chemical reactio...

In certain physical systems measuring one variable of the system modi es the values of any number of other variables unpredictably. We show in this paper that under these conditions a parallel approach succeeds in carrying out the required measurement while a sequential approach fails. Speci cally, we show that for a nonlinear dynamical system, namely, the Belousov-Zhabotinskii chemical reactio...

a three year old boy with delayed separation of the umbilical cord, recurrent pyogenic infections and common variable immundeficiency is presented. the immunoglobulin measurement was severely abnormal. to the best of our knowledge, the existance of leukocyte adhesion disorder together with common variable immunodeficiency (cyid) in a patient has not been reported prior to this study.